Which of the following is not caused due to `SO_(2)`?

Options

A. Cough
B. Shortness of breath
C. Spasm of larynx
D. Blindness

Answer

To determine which condition is not caused by sulfur dioxide (SO₂), we will analyze the effects of SO₂ inhalation based on the provided options.

### Step-by-Step Solution:

1. **Understanding SO₂ Effects**: Sulfur dioxide is a significant air pollutant that can have various health effects when inhaled. It primarily irritates the respiratory system.

2. **Analyzing the Options**:
- **Option 1: Cough**: Inhalation of SO₂ can lead to irritation of the throat and lungs, which often results in coughing. Therefore, cough is caused by SO₂.
- **Option 2: Shortness of Breath**: High levels of SO₂ can cause swelling in the lungs, leading to difficulty in breathing or shortness of breath. Thus, this condition is also caused by SO₂.
- **Option 3: Spasm of Larynx**: SO₂ can cause irritation that may lead to spasms in the larynx, making it difficult to speak or breathe. Hence, this is another condition caused by SO₂.
- **Option 4: Blindness**: There is no direct evidence that inhalation of SO₂ causes blindness. While SO₂ can irritate the eyes, it does not lead to blindness.

3. **Conclusion**: Based on the analysis of the options, the condition that is not caused by sulfur dioxide is **blindness**.

### Final Answer:
The correct option is **blindness**.

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